"I don't know what happened actually, I felt like I was playing perfectly, I was so focused the whole match, even I am surprised that I can do that," said the 54th-ranked Swiatek, who fired 30 winners and won 81 percent of her first-serve to wrap up the victory.
Moussa Djenepo scored his first home goal for Southampton in the 41st minute and Oriol Romeu smacked home a sensational volley with just over 20 minutes remaining as the Saints kept their second clean sheet in two games.
Association president Fritz Keller demanded a series of victories to collect points helping to avoid relegation "as we can't afford to go down to a lower group."
After dominating the upper hand across the final quarter, Zhejiang kept up its all-win record in the ongoing 2020-2021 season.
Inner Mongolia tamed Hebei by 44 points on Friday. Center Li Yueru shot 10 of 12 from the field to finish with a game-high 21 points. Chen Liyu helped with 16. Wei Wei nailed 14 points off the bench.
With Sichuan's offense bogged down, Dongguan retook the lead and delivered the final blow with efficient offensive late in the fourth to make it 78-71.
Things changed though for Schalke in the 23rd minute when Suat Serdar was unable to continue after a tackle. Can Bozdogan came in for the injured defensive midfielder and the youngster grabbed the worst possible start into the game as he cleared Emil Forsberg's square pass into the wrong goal in the 31st minute.
The estimated timing for the start of training camp will be announced at a later date.
Also on Saturday, fifth-seeded Stefanos Tsitsipas earned a spot in the fourth round after his Slovenian opponent Aljaz Bedene retired from the match and hobbled off the court when trailed by 6-1, 6-2, 3-1.
"I got a bit emotional last two points of my match. I really started to think still about the match because in tennis we really never know when it's the end. But my memories, happy memories, when I made my comeback here in 2017, when I step on the Philippe Chatrier, I couldn't really imagine me to be in the quarterfinal of this slam. Everything just came back to me," said Kvitova, who was attacked by a break-in knife-wielding robber at her home in the Czech Republic during the off-season of 2016 which left her dominant left hand seriously injured. It was at Roland Garros that the two-time Grand Slam champion made her comeback.
In the first set, Shandong and Tianjin traded leads from the offset. After Shandong's Sun Jie left the court through injury, Tianjin leveled the score 15-15 and then took the set 25-21.